Wi-Fi SMS & MMS app?

Is there an app where I can send/receive SMS & MMS messages with my phone number and not need the other people to have the app?

I live in the middle of nowhere now and the signal is atrocious, MMS doesn't even work, ever. So I need something where I can text normally with my number and be able to receive messages over Wi-Fi. I tried Facebook messenger, but that didn't work for what I need. 

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